Can Lis : la huella de la arquitectura de Jørn Utzon a través de esta obra

La tesis “CAN LIS, La huella de la arquitectura de Jørn Utzon a través de su obra Can Lis” analiza en profundidad la vivienda que Jørn Utzon realizó para sí mismo en la entonces calle de la Media Luna, Porto Petro, Mallorca, entre los años 1970-74. La investigación plantea el análisis de esta obra maestra de la arquitectura, sus causas e intenciones, su proceso proyectual, su proceso constructivo, sus relaciones e influencias y sus significados últimos. Este estudio es fruto de una labor de investigación que comenzó hace más de 10 años. Enfrentarse a una obra cuya imagen es tan conocida es una tarea menos sencilla de lo que pudiera parecer. La descripción del proceso de trabajo de Jørn Utzon en Can Lis, y de su método en general, contiene un considerable número de mitificaciones que han sido comúnmente sostenidas por diversos estudiosos de prestigio, que han abordado esta obra sin un estudio razonable de la documentación existente, ni una investigación de los archivos, ni una comprobación de los hechos o una consulta de los testigos intervinientes. Por ello, cuestiones fundamentales habían quedado en el terreno de la conjetura y permanecía deformada la visión general de los procesos de Jørn Utzon en Mallorca. La tesis se ha estructurado en dos grandes apartados que permitan la comprensión de los elementos fundamentales para su gestación: por un lado, el proceso proyectual y constructivo con sus circunstancias y condicionantes y, por otro, el conjunto de hechos y conceptos que han influido de manera directa y significativa en su concreción. Esta investigación contiene una cantidad considerable de materiales y hechos inéditos, fruto de su desarrollo, así como documentación y dibujos nunca publicados anteriormente. Es por tanto, el estudio más completo realizado sobre Can Lis hasta la fecha. En la primera parte de la tesis “CAN LIS” se aborda todo el proceso proyectual de Can Lis desde los primeros croquis, con las condiciones y motivaciones iniciales, los proyectos sucesivos, el proyecto básico y el proyecto de ejecución, hasta el proceso de construcción, su desarrollo y circunstancias, así como las modificaciones posteriores introducidas. Estos elementos se estructuran en tres apartados 1) Las condiciones y condicionantes iniciales. 2) El proceso proyectual. 3) El proceso constructivo. En la segunda parte de la tesis “La huella de la arquitectura de Jørn Utzon a través de su obra Can Lis” se han analizado de manera particular algunos hechos arquitectónicos y vitales previos que fueron especialmente determinantes en la concepción de Can Lis y la serie de influencias directas que son imprescindibles para la comprensión de las condiciones en que se desarrolló y de las ideas que alumbra. Estudios previos de toda la trayectoria de Utzon y todo el corpus de influencias ayudaron a determinar cuáles de ellos son fundamentales para la comprensión del proceso. Estos elementos se pueden considerar directamente precursores de ideas desarrolladas específicamente en Can Lis: 4) La experimentación en Australia: la naturaleza, la dimensión humana y la técnica. La casa de Bayview. 5) Utzon y el descubrimiento de lo islámico: la secuencia espacial, la materia y la luz de la arquitectura islámica como experiencia de aprendizaje. 6) Paisaje sacro, hombre y arquitectura: la búsqueda de Utzon en Grecia. Las conclusiones de este estudio determinan una serie de certezas sobre los procesos de Jørn Utzon en Can Lis, y en su obra global, durante las diversas fases creativas que desmitifican muchos acercamientos precedentes: la visión universal de la arquitectura en su acercamiento al proyecto, el entretejido método proyectual de Utzon, la precisa búsqueda del desarrollo constructivo junto a la ejemplaridad en el rigor, la vitalidad y la espiritualidad con que Utzon aborda la arquitectura, la trascendencia de la forma de habitar de las personas y el valor que para Utzon tiene la arquitectura como medio para revelar el orden universal que nos rodea. ABSTRACT “CAN LIS. The footprint of Jørn Utzon´s architecture through his work Can Lis” carries out a thorough analysis of the house Jørn built for himself between 1970 and 1974 on the street formerly called Calle de la Media Luna, in Porto Petro on the island of Mallorca. The research focuses on the causes that brought about this masterpiece, its purposes, design and building processes, its relations with and influences on other buildings and its ultimate meanings. This study is the result of a research that started over 10 years ago. Approaching a piece of work whose image is so well-known is harder than one might think. Many aspects of Jørn Utzon´s working method in Can Lis particularly but also generally have been described inaccurately and mythicized by several renowned scholars, who hadn´t really studied the existing documents or archives nor confirmed their hypotheses or consulted witnesses of the creation of Can Lis. This is why many key issues have been uncertain all this time and the general idea about Utzon´s working process in Mallorca has been distorted. This dissertation has been structured into two main sections with the aim of helping understand all the facts that led to the creation of the building: the first part describes the design and building processes, as well as the circumstances and constraints under which they were carried out. The second part presents the events and ideas that directly and indirectly influenced the final work. This thesis contains a large amount of unpublished material and information, documents and drawings from the creation process as the inevitable result of a long lasting tenacious research. It probably is the most comprehensive study on Can Lis so far. The first section, “CAN LIS”, addresses the design process of Can Lis from the very first sketches all the way through the subsequent plans, including basic and execution plans and the building process up to the changes that were later carried out on the building. The project´s initial conditions and Utzon´s first motivations and the evolution and circumstances of the building process are also described in this section, which has been divided into three parts: 1. The initial conditions and constraints. 2. The design process. 3. The building process. The second section, “The footprint of Jørn Utzon´s architecture through his work Can Lis”, focuses on some events in Utzon´s life and some of his architectural experiences prior to the creation of Can Lis that were decisive to it. Also the direct influences on the process which are key to understanding the conditions under which the creation was carried out as well as the ideas Can Lis sheds a light on are illustrated in this section. A thorough study of the whole process Utzon went through and of all the influences he was subjected to helped determine what is crucial to comprehending Can Lis. These events or experiences can be considered as the direct precursors to the ideas that crystallised in this master piece: 4. Experiments carried out in Australia: nature, human and technical dimensions. The Bayview house. 5. Utzon´s discovery of Islamic architecture: spatial sequences, matter and light as a learning experience. 6. Sacred landscape, man and architecture: Utzon´s quest in Greece. The findings of this research determine some aspects of Utzon´s working methods at every stage of the creation process both in Can Lis and in general, thus shedding light on previous mistaken ideas about Utzon´s way of working. A universal understanding of architecture, an intertwined design method, a tenacious search for the exact construction solutions, an exemplary rigour, vitality and spirituality in the design approach, the transcendence of our way of living and architecture´s potential to reveal the Universal order that surrounds are all aspects that do define Utzon as an architect.

Effect of Initial On-Site Curing on 28-Day Cylinder Strength

The initial curing of concrete specimens for quality assurance is addressed in different ways in testing standards, which often specify requirements that are difficult to meet in practice unless very costly initial curing chambers are available. The failure to meet these requirements in many areas of the world does not appear to result in adverse consequences. This study analyzed six initial curing temperature schemes, all with cycles similar to natural conditions to avoid the simplifications inherent in constant temperature curing. Three strengths of concrete and two initial curing times (24 and 72 hours) were used in this study. The findings showed that initial curing time had no effect on 28-day strength. The 28-day strength also proved to be resilient to maximum and minimum initial curing temperatures outside the limits stated in the standards considered in this study

STC power for 15MW of PV comparing nameplate, initial power and power after 4 years

To date, the majority of quality controls performed at PV plants are based on the measurement of a small sample of individual modules. Consequently, there is very little representative data on the real Standard Test Conditions (STC) power output values for PV generators. This paper presents the power output values for more than 1300 PV generators having a total installed power capacity of almost 15.3 MW. The values were obtained by the INGEPER-UPNA group, in collaboration with the IES-UPM, through a study to monitor the power output of a number of PV plants from 2006 to 2009. This work has made it possible to determine, amongst other things, the power dispersion that can be expected amongst generators made by different manufacturers, amongst generators made by the same manufacturer but comprising modules of different nameplate ratings and also amongst generators formed by modules with the same characteristics. The work also analyses the STC power output evolution over time in the course of this 4-year study. The values presented here could be considered to be representative of generators with fault-free modules.

Discussion of “Initial Pore Pressure from Vertical Surface Loads” by Jacobo Bielak (September, 1982)

The author presents a very interesting application of the ideas developed by Scott to determine the initial pore pressure in excess of the hydrostatic pore pressure in linear, elastic, homogeneous and isotropic soil-skeleton. Scott demonstrates that under vertical surface loads the problem is governed by Laplace's equation. Nevertheless the writers' think that it could be interesting to state clearly the conditions under which this analogy can be applied.

A novel scanning lens instrument for evaluating Fresnel lens performance: equipment development and initial results

A system dedicated to the optical transmittance characterization of Fresnel lenses has been developed at NREL, in collaboration with the UPM. The system quantifies the optical efficiency of the lens by generating a performance map. The shape of the focused spot may also be analyzed to understand change in the lens performance. The primary instrument components (lasers and CCD detector) have been characterized to confirm their capability for performing optical transmittance measurements. Measurements performed on SoG and PMMA lenses subject to a variety of indoor conditions (e.g., UV and damp heat) identified differences in the optical efficiency of the evaluated lenses, demonstrating the ability of the Scanning Lens Instrument (SLI) to distinguish between the aged lenses.

Optimization and evaluation in space conditions of multi-GHz optical modulators

Among the different optical modulator technologies available such as polymer, III-V semiconductors, Silicon, the well-known Lithium Niobate (LN) offers the best trade-off in terms of performances, ease of use, and power handling capability [1-9]. The LN technology is still widely deployed within the current high data rate fibre optic communications networks. This technology is also the most mature and guarantees the reliability which is required for space applications [9].In or der to fulfil the target specifications of opto-microwave payloads, an optimization of the design of a Mach-Zehnder (MZ) modulator working at the 1500nm telecom wavelength was performed in the frame of the ESA-ARTES "Multi GigaHertz Optical Modulator" (MGOM) project in order to reach ultra-low optical insertion loss and low effective driving voltage in the Ka band. The selected modulator configuration was the X-cut crystal orientation, associated to high stability Titanium in-diffusion process for the optical waveguide. Starting from an initial modulator configuration exhibiting 9 V drive voltage @ 30 GHz, a complete redesign of the coplanar microwave electrodes was carried out in order to reach a 6 V drive voltage @ 30GHz version. This redesign was associated to an optimization of the interaction between the optical waveguide and the electrodes. Following the optimisation steps, an evaluation program was applied on a lot of 8 identical modulators. A full characterisation was carried out to compare performances, showing small variations between the initial and final functional characteristics. In parallel, two similar modulators were submitted to both gamma (10-100 krad) and proton irradiation (10.109 p/cm²) with minor performance degradation.